<template>
  <div>
    <!-- 面包屑区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">
        首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理
      </el-breadcrumb-item>
      <el-breadcrumb-item :to="{ path: '/goods' }">商品列表
      </el-breadcrumb-item>
      <el-breadcrumb-item>添加商品
      </el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert
        title="添加商品区域"
        type="info"
        center
        show-icon
        :closable="false"
      >
      </el-alert>
      <!-- 步骤条区域 -->
      <el-steps
        :space="200"
        :active="activeIndex - 0"
        finish-status="success"
        align-center
      >
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- tab栏区域 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
        label-position="top"
      >
        <el-tabs
          v-model="activeIndex"
          :tab-position="'left'"
          :before-leave="beforeTabLeave"
          @tab-click="tabClicked"
        >
          <el-tab-pane
            label="基本信息"
            name="0"
          >
            <el-form-item
              label="商品名称"
              prop="goods_name"
            >
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item
              label="商品价格"
              prop="goods_price"
              type="number"
            >
              <el-input v-model="addForm.goods_price"></el-input>
            </el-form-item>
            <el-form-item
              label="商品重量"
              prop="goods_weight"
              type="number"
            >
              <el-input v-model="addForm.goods_weight"></el-input>
            </el-form-item>
            <el-form-item
              label="商品数量"
              prop="goods_number"
              type="number"
            >
              <el-input v-model="addForm.goods_number"></el-input>
            </el-form-item>
            <el-form-item
              label="商品分类"
              prop="goods_cat"
            >
              <el-cascader
                :options="cateList"
                v-model="addForm.goods_cat"
                :props="cateProps"
                @change="handleChange"
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane
            label="商品参数"
            name="1"
          >
            <el-form-item
              v-for="item in manyTabDate"
              :key="item.attr_id"
              :label="item.attr_name"
            >
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox
                  v-for="(cb,i) in item.attr_vals"
                  :key="i"
                  :label="cb"
                  border
                  size="mini"
                ></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane
            label="商品属性"
            name="2"
          >
            <el-form-item
              v-for="item in onlyTabDate"
              :key="item.attr_id"
              :label="item.attr_name"
            >
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane
            label="商品图片"
            name="3"
          >
            <!-- action表示图片上传的后台pai接口 -->
            <el-upload
              :action="uploadUrl"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headersObj"
              :on-success="handleSuccess"
            >
              <el-button
                size="small"
                type="primary"
              >点击上传</el-button>
              <div
                slot="tip"
                class="el-upload__tip"
              >
                只能上传jpg/png文件，且不超过500kb</div>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane
            label="商品内容"
            name="4"
          >商品内容
            <quill-editor v-model="addForm.goods_introduce">
            </quill-editor>
            <el-button
              type="primary"
              class="btnAdd"
              @click="add"
            >添加商品
            </el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览对话框 -->
    <el-dialog
      title="图片预览"
      :visible.sync="previewVisible"
      width="50%"
    >
      <img
        :src="previewPath"
        class="previewImg"
      >
    </el-dialog>
  </div>
</template>
<script>
export default {
  data() {
    return {
      activeIndex: '0',
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        goods_cat: [],
        pics: [],
        // 商品的详情描述
        goods_introduce: '',
        attrs: []
      },
      addFormRules: {
        goods_name: [
          {
            required: true,
            message: '请输入商品名称',
            trigger: 'blur'
          }
        ],
        goods_price: [
          {
            required: true,
            message: '请输入商品价格',
            trigger: 'blur'
          }
        ],
        goods_weight: [
          {
            required: true,
            message: '请输入商品重量',
            trigger: 'blur'
          }
        ],
        goods_number: [
          {
            required: true,
            message: '请输入商品数量',
            trigger: 'blur'
          }
        ]
      },
      goods_cat: [
        {
          required: true,
          message: '请选中商品分类',
          trigger: 'blur'
        }
      ],
      cateList: [],
      cateProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children',
        expandTrigger: 'hover'
      },
      //   动态参数列表数组
      manyTabDate: [],
      //   静态参数列表数组
      onlyTabDate: [],
      // 上传图片的url地址
      uploadUrl: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 图片上传的请求头
      headersObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      previewPath: '',
      previewVisible: false
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类数据失败！')
      }
      this.cateList = res.data
    },
    // 级联选择器变化触发
    handleChange() {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat.length = []
      }
    },
    // 判断进度是否能进入下一个
    beforeTabLeave(nextName, activeNmae) {
      if (activeNmae === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类')
        return false
      }
    },
    async tabClicked() {
      // 证明访问的是动态参数面板
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: 'many' }
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('获取动态参数列表失败')
        }
        res.data.forEach(item => {
          item.attr_vals =
            item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTabDate = res.data
      } else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: 'only' }
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('获取静态属性列表失败')
        }
        // res.data.forEach(item => {
        //   item.attr_vals =
        //     item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        // })
        this.onlyTabDate = res.data
      }
    },
    // 处理图片预览效果
    handlePreview(file) {
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 处理图片移除效果
    handleRemove(file) {
      const filePath = file.response.data.tmp_path
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      this.addForm.pics.splice(i, 1)
    },
    // 监听图片上传成功的事件
    handleSuccess(res) {
      const picInfo = { pic: res.data.tmp_path }
      this.addForm.pics.push(picInfo)
    },
    async add() {
      this.$refs.addFormRef.validate(valid => {
        if (!valid) {
          return this.$message.error('请填写必要的表单项！')
        }
        this.addForm.goods_cat = this.addForm.goods_cat.join(',')
      })
      this.manyTabDate.forEach(item => {
        const newInfo = {
          attr_id: item.attr_id,
          attr_value: item.attr_vals.join(' ')
        }
        this.addForm.attrs.push(newInfo)
      })
      this.onlyTabDate.forEach(item => {
        const newInfo = {
          attr_id: item.attr_id,
          attr_value: item.attr_vals
        }
        this.addForm.attrs.push(newInfo)
      })
      const form = this.addForm
      const { data: res } = await this.$http.post('goods', form)
      if (res.meta.status !== 201) {
        return this.$message.error('添加商品失败！')
      }

      this.$message.success('添加商品成功！')
      this.$router.push('/goods')
    }
  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>
<style lang="less" scoped>
.el-checkbox {
  margin: 0 5px 0 0 !important;
}
.previewImg {
  width: 100%;
}
.btnAdd {
  margin-top: 15px;
}
</style>